A catch-all notebook pretty much lives up to its name. It is for any and everything. I use mine for brain dumps, things I want to remember, important dates, to-do lists, random things I want to Google later, and things that are stressing me out. You name it, it is probably in my catch-all notebook. The reason I find this works well for me is that there is no pressure to keep it up. If you are anything like me, you probably have a few planners lying around that are filled out for a few weeks or months, and then completely blank. With the catch-all notebook, I can forget about it for a month, and then come back to it, no shame, no stress, it's just there when I need it. If you decide to go for a catch-all notebook, it can be whatever you want it to be, but I would recommend something you can have in your bag, that way it is there whenever you need it!